| 摘要 |
PROBLEM TO BE SOLVED: To execute excellent cutting performance for a long period without causing breakage or chipping of a cutting blade in continuous cutting of various kinds of steel under heavy cutting conditions. SOLUTION: A cutting tool made of surface covering WC-based cemented carbide is obtained by physically depositing a hard covering layer constituted of a lower layer having 0.1 to 10μm of a mean layer thickness and an upper layer having a mean layer thickness of 0.5 to 10μm, on the surface of a WC- based cemented carbide substrate. The physically deposited lower layer is constituted of a Ti-compound made of one or two kinds out of a TiC layer, TiN layer, TiCN layer, TiCO layer, and TiCNO layer, while the physically deposited upper layer is constituted of an Al2O3-main-body layer, which is obtained by substituting for solid solution a part of Al in the crystal structure of Al2O3 out of one or more than two kinds of Ti, Zr, and Hf whose composition in relation to the sum with Al is 0.01 to 10 atomic percent.
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